I've been trying to improve the performance of my brakes (mushy, no feel, etc..), and have been reading with interest about upgrading calipers.

I have a front end from a 2003 GSXR1000 in my garage, and I am actually already using the master cylinder from this system on my ZX6R (see bent brake lever causing lockup, as well as clearance problems with stock m/c). Does anyone know if the GSXR calipers would be compatible with the ZX6R? I know the GSXR has 320mm rotors, while the ZX6R has 300mm...

If it is possible, that would be a quick and easy solution for me. The GSXR front end was on an SV650 track bike, and I know personally how well that system works.

if its sitting in your garage take them off an find out. shouldnt take anymore than 10 minutes

OP: that's a pretty unique question that I doubt anyone will be able to answer faster than just going to the garage and checking. First issue I would imagine is if they bolt up to the mounting holes. But when/if you check, let us all know.

yeah, but watch the pads in the old Gixers caliper, check it first for plenty of pad material! Caliper swap has nothing to do with rotor sizes, you need to watch the caliper mounting tab offset/distance whatever it is. Kawi uses 100mm offset calipers...